Meritor T-2111 Series, Руководство по обслуживанию, Страница: 43 / 46

Tire Mismatch
NOTE:
•
Positive mismatch calculations indicate the
front axle is PULLING.
•
Negative mismatch calculations indicate the
rear axle is PUSHING.
•
A positive mismatch is the preferred condition
for vehicle performance and stability.
The following calculation is based on tire mismatch at
low speeds before tire expansion occurs. This is the
normal usage of a transfer case as one axle, usually
the front, will be disengaged at higher operating
speeds.
% Mismatch
LO
=
LR
F
= Tire Loaded Radius - Front
LR
R
= Tire Loaded Radius - Rear
R
AR
= Axle Ratio - Rear
R
AF
= Axle Ratio - Front
The following calculation is for high speeds. A normal
transfer case should have one drive output
declutched in this condition. This calculation is mainly
for transfer cases which include a differential.
% Mismatch
HI
=
TRPM
R
= Revs Per Mile of Rear Tires
TRPM
F
= Revs Per Mile of Front Tires
Page 37
Section 8
Specifications
[(LR
F
) (R
AR
) – (LR
R
) (R
AF
)] * 100%
(LR
F
) (R
AR
)
[(TRPM
R
) (R
AR
) – (TRPM
F
) (R
AF
)] * 100%
(TRPM
R
) (R
AR
)
Acceptable limits for calculations:
With thru shaft between front and rear output:
High speed mismatch: ± 1.5%
Low speed mismatch: ± 1.0%
With declutch but no differential:
High speed mismatch: ± 2.0%
Low speed mismatch: ± 1.5%
With differential:
High speed mismatch: ± 3.0%
Low speed mismatch: ± 3.0%
NOTE:
For special off-road low traction conditions,
higher values may be acceptable. The allowable
mismatch is increased in applications where the
transfer case has excess torque capacity.
Pro Gear and Transmission • 906 W. Gore St. Orlando, FL 32805 • 1 (877) 776-4600 / (407) 872-1901 • parts@eprogear.com